Synthesis and iron(III) complexing ability of CacCAM, a new analog of enterobactin possessing a free carboxylic anchor arm. Comparative studies with TRENCAM
作者:Daniel Imbert、Fabrice Thomas、Paul Baret、Guy Serratrice、Didier Gaude、Jean-Louis Pierre、Jean-Pierre Laulhère
DOI:10.1039/b000229l
日期:——
does not significantly alter the iron chelating ability of the ligand. Kinetics of iron exchange between Fe(III)–EDTA and CacCAM or TRENCAM involves similar rate constants (16±1 and 14±2 M−1 s−1, respectively). EPR data show that the iron(III) does not have the same distorted rhombic geometry in the two complexes. Fe(III)–CacCAM has been tested as a source of iron in nutritional experiments with Arabidopsis
通过将三个儿茶酚酰胺亚基连接到CO 2 H-官能化的三胺主链上,合成了一种新的三儿茶酚酸酯CacCAM 。配位体及其铁(III)配合物的溶液配位化学已经通过电位,光谱和动力学方法进行了研究。将结果与使用TRENCAM获得的结果进行比较,TRENCAM具有相同的儿茶酚酰胺亚基,但具有TREN [三(2-氨基乙基)-胺]骨架。稳定常数(日志β 110 = 42.9,PFE = 27.5)接近于TRENCAM的(对数β 110 = 43.6,PFE = 27.8),表明主链的变化不显著改变配体的铁螯合能力。Fe(III)之间的铁交换动力学)– EDTA和CacCAM或TRENCAM涉及相似的速率常数(分别为16±1和14±2 M -1 s -1)。EPR数据表明,铁(III)在两个络合物中不具有相同的扭曲菱形几何形状。Fe(III)–CacCAM已在拟南芥植物细胞的营养实验中被测试为铁的来源:其效率良好,可与Fe(III)–EDTA